#include "Cos.h"
#include "Sin.h"
#include "Minus.h"

long double Cos::calcul(long double aux1)
{
    return cosl(aux1);
}

long double Cos::calcul()
{
    if (!fStang)
        exit(1);

    return calcul(fStang->calcul());
}

char *Cos::derivare()
{
    char *aux1, *aux2, *aux, *aux00, *aux01;

    if (!fStang)
        exit(1);

    aux1 = fStang->derivare();
    aux2 = fStang->toString();

    aux00 = Sin::concatTermeni(aux2);
    aux01 = Minus::concatTermeni((char*)"0", aux00);
    aux = Inmultit::concatTermeni(aux00, aux01);
    delete aux1; delete aux2; delete aux00; delete aux01;

    return aux;
}

long double Cos::calculDerivata()
{
    if (!fStang)
        exit(1);

    return Minus::calcul(0, Inmultit::calcul(fStang->calculDerivata(),
            Sin::calcul(fStang->calcul())));
}

char *Cos::toString()
{
    char *aux, *aux1;
    int nrP;

    if (!fStang)
        exit(1);
    aux1 = fStang->toString();

    aux = concatTermeni(aux1);
    delete aux1;

    return aux;
}

char *Cos::concatTermeni(char *aux1)
{
    char *aux;
    int nrP;

    nrP = aux1[0] == '(' ? 0 : 2;
    aux = new char[strlen(aux1) + 4 + nrP];

    strcpy(aux, "cos");
    if (nrP) strcat(aux, "(");
    strcat(aux, aux1);
    if (nrP) strcat(aux, ")");

    return aux;
}

